Note that you are prompted to supply both the CORP\User1 password and a Directory Services Restore Mode (DSRM) password, and to restart DC2.

Now that the XPrem virtual network has its own DNS server (DC2), you must configure the XPrem virtual network to use this DNS server. Run these commands from the Azure PowerShell command prompt on your local computer.

From the Azure portal on your local computer, connect to DC1 with the CORP\User1 credentials. To configure the CORP domain so that computers and users use their local domain controller for authentication, run these commands from an administrator-level Windows PowerShell command prompt on DC1.